Harrow.



No. 801,764. 7 PATENTED OCT. 10, 1905.

M. BRENNAN.

HARROW.

APPLICATION FILED APE. 4.1905.

2 SHEETS-SHEET 1 Qtbozuma R PATENTED OCT. 10, 1905.

M. BRENNAN.

HARROW.

APPLICATION TILED APR.4.1905.

2 SHEETS-SHEET 2.

z: m Baum? Suventoz EE- fifaflml rezmarz Q/Vi huzoow UNITED STATESPATENT OFFICE.

HARROW.

' Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed April 4, 1905. Serial No. 253,838.

To all wit/Mn, it 72m concern:

Be it known that I, hlARTIN BRENNAN, a citi- Zen of the United States,residing at Garretson, in the county of Minnehaha, State of SouthDakota, have invented certain new and useful Improvements in Harrows;and 1 do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to harrows, and more particularly to means fordumping harrows, by which is meant the operation of ridding theharrow-teeth of accumulations of vegetable growth, the object of theinvention being to provide means for automatically raising and droppingthe barrow-frame during the progress of the implement.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a rear elevation showing a harrow embodying the presentinvention. Fig. 2 is a vertical section taken longitudinally through theharrow and showing the elevating wheel and rack in elevation and inactive positions. Fig. 3 is a top plan view of the harrow. Fig. A a viewsimilar to Fig. 2 with the parts in inoperative position.

Referring now to the drawings, there is shown a harrow including a frameincluding the longitudinal beams 5 and (Sand transverse beams T, theseveral beams being provided with the usual harrow-teeth 8. The frontends of the longitudinal beams 5 and e are connected to a fronttransverse beam 9, to which are connected draft appliances 10 forhitching draft-animals to the harrow. Secured to the beams 5 and 6 arethe forwardlydirected ends of an arch 11, which stands in a verticalplane transversely of and in the rear of the harrow-frame. From thecentral portion of the arch there depends a standard consisting of aplate bent upon itself to form the spaced arms 12 and 13 and theconnectingbight 1a, which latter is riveted to the central portion ofthe arch. The arms 12 and 13 are slotted vertically, as shown at 15, andin these slots are received the ends of an axle 16, on which is fixed aground-wheel 17. \Vith this arrangement it will be seen that the rearportion of the barrow-frame with the arch and the standard may be raisedand lowered, while permitting the wheel to run upon the ground.

To raise and subsequently drop the harrowframe at times, theground-wheel is provided with a pinion 18, which is fixed to the axle16, so that it will rotate with the ground-wheel. Pivoted at its upperend against the upper portion of the inner face of the arm 12 of thestandard is a rack-bar 19, which is held normally with its lower endswung rearwardly by means of a helical spring 20, connected to therack-bar above its pivot and to the standard. A rock-shaft 21 is mountedin the arch and at one end is provided with a treadle 22 in position forengagement by the foot of the operator to rock the shaft in onedirection. At the opposite end of the shaft is a depending arm 23, whichis pivotally connected with the lower end of the rack-bar in suchposition that when the treadle is depressed the rackbar will be swunginto engagement with the pinion that is carried by the ground-wheel. \Vhen the rack-bar engages the pinion at the rear side of the latter, asillustrated, forward movement of the ground-wheel will cause the pinionto feed the rack-bar upwardly, so that the barrow-frame will becorrespondingly raised, and the accumulations upon the teeth will dropfrom the latter. \Vhen the lowermost tooth of the rack-bar has movedfrom engagement with the pinion, the treadle may be released, and thespring will serve to throw the rack-bar away from the pinion, and thebarrow-frame will drop to reengage its teeth with the ground. Thisoperation may be repeated as often as may be desired to rid the teeth ofthe accumulated vegetation.

llhat is claimed isl. The combination with a harrow-frame provided withteeth, of a ground-wheel mounted in the frame and with respect to whichthe latter is vertically movable, a pinion carried by the ground-wheel,a rack-bar carried by the frame and means for throwing the rackbar intoand out of engagement with the pinion.

2. The combination with a harrow-frame having teeth, said frameincluding an arch and a standard carried by the arch and comprisinglaterally-spaced arms having vertical slots,

of a ground-Wheel disposed between the arms bar into and out ofengagement With the pinof the standard and having a shaft rotatably ion.

mounted in the slots of the arms and moving In testimony whereof I aflixmy signature in vertically therein, a pinion carried by the presence oftwo Witnesses.

5 ground-Wheel, a rack-bar pivoted atits upper MARTIN BRENNAN. end tothe standard and movable With its lower Witnesses:

end portion into and out of engagement with E. E. CROSS,

the pinion, and means for moving the rack- W. J. WEST.

